1970-1971 DODGE POLARA 6CYL ENGINES. 1 x AA5052 Aluminum Shroud. 1970-1973 PLYMOUTH DUSTER 6CYL ENGINES. 1969-1973 DODGE DART 6CYL ENGINES. The fan shroud basically houses the fan blades securing it in place and keeping it from damaging the other engine components that may disturb the smooth and even operation of the engine.